Same as peonage, except that peonage can refer to a group or class of peons as well as a condition ("served in conditions of peonage"). "Peonry" refers only to a group or class of peons.

From an online article about McDonald's and their resistance to paying a living wage: "Holders of McDonald’s stock will not care either, remaining comfortably in the shadows as they enjoy their completely unearned (in the sense that McDonald’s peonry earns its wages) dividends."